Products
Development of an in-memory database, specialized for analytical workloads was started at White Cross Systems, Limited in 1988. The first beta release of that system was in 1989. It was based on the INMOS Transputer. The first full production release was offered in 1992. White Cross merged in 2005 with Kognitio, Limited in the United Kingdom and is currently marketing version 8 of the same code base as the "Kognitio Analytical Platform".
Development of a relational in-memory database system was started at Perihelion Software in 1991, and had its first commercial release in early 1993 under the name Polyhedra. The product was later spun out as a separate company, which was acquired by Enea AB in 2001. Polyhedra was developed from the start as a commercial offering for use in SCADA and embedded systems.
Companies needing a fast data storage mechanism for their own products have often developed their own, in-house solution which they later marketed commercially. For example, research in main-memory database systems started around 1993 at Bell Labs. It was prototyped as the Dali Main-Memory Storage Manager. This research lead to the commercial main-memory database, Datablitz.
In recent years, main memory databases have attracted the interest of larger database vendors.
Terracotta, Inc., is an in-memory database created by the developers of Ehcache. It can hold the largest amount of data in memory on the smallest number of servers. SAG acquired the San Francisco based company in 2010 to imbed with their BPM solutions.
TimesTen, a start-up company founded by Marie-Anne Neimat in 1996 as a spin-off from Hewlett-Packard, was acquired by Oracle Corporation in 2005. Oracle now markets this product as both a standalone database and an in-memory database cache to the Oracle database.
In 1999, Altibase Corporation developed an In-Memory DBMS offering. In 2012, Altibase released version 6 of its hybrid database flagship product, ALTIBASE HDB.
Also in 1999, Microsoft COM+ IMDB solution provided an application with fast access to data through OLE DB, without incurring the overhead associated with storing and accessing data to and from physical disks that worked within Windows NT 3.5 and then upcoming Windows 2000.
IBM acquired solidDB in 2008, and Microsoft is widely rumored to be launching an in-memory solution in 2009. VoltDB, founded by DBMS pioneer Michael Stonebraker, announced the general availability of its namesake in-memory database in May 2010, and offers versions of the product under open source (GPLv3) and commercial licenses.
SAP AG announced general availability of their own in-memory product, SAP HANA, in June 2011.
WebDNA 7, released as freeware, is a robust hybrid in-memory database system and scripting language designed for the World Wide Web.
Read more about this topic: In-memory Database
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